Some of you seem to be having trouble with linear algebra refresher question. This means you need to read up on linear algebra--especially
eigen vectors/eigen values/matrix decomposition. This question is put there to make you realize the importance of reviewing this material if you don't
already know it (as we will need it starting about Thursday of this week for the rest of the semester).
You can review this material by reading any of the linear algebra refresher readings at the end of the readings list (it is titled "background and refershers").
If you think you will need more direct help, send a note to the TA ( email@example.com ). If enough of you need help, he can hold a review/recitation session
on Wednesday during his office hours.